// Copyright 2014-2021 The winit contributors
// Copyright 2021-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0

use tao::{
  event::{DeviceEvent, Event, WindowEvent},
  event_loop::{ControlFlow, EventLoop},
  window::WindowBuilder,
};

#[allow(clippy::collapsible_match)]
#[allow(clippy::single_match)]
fn main() {
  env_logger::init();
  let event_loop = EventLoop::new();

  let window = WindowBuilder::new()
    .with_title("Mouse Wheel events")
    .build(&event_loop)
    .unwrap();

  event_loop.run(move |event, _, control_flow| {
    *control_flow = ControlFlow::Wait;

    match event {
      Event::WindowEvent { event, .. } => match event {
        WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
        _ => (),
      },
      Event::DeviceEvent { event, .. } => match event {
        DeviceEvent::MouseWheel { delta, .. } => match delta {
          tao::event::MouseScrollDelta::LineDelta(x, y) => {
            println!("mouse wheel Line Delta: ({},{})", x, y);
            let pixels_per_line = 120.0;
            let mut pos = window.outer_position().unwrap();
            pos.x -= (x * pixels_per_line) as i32;
            pos.y -= (y * pixels_per_line) as i32;
            window.set_outer_position(pos)
          }
          tao::event::MouseScrollDelta::PixelDelta(p) => {
            println!("mouse wheel Pixel Delta: ({},{})", p.x, p.y);
            let mut pos = window.outer_position().unwrap();
            pos.x -= p.x as i32;
            pos.y -= p.y as i32;
            window.set_outer_position(pos)
          }
          _ => (),
        },
        _ => (),
      },
      _ => (),
    }
  });
}
